The figure shows some angles identified on triangle .
Identify which angle is an exterior angle.
Identify which angle is an interior angle.
Determine whether the following sentence is true or false: It is possible to draw a triangle on a plane with two obtuse angles.
In a triangle , if , what type of angle is the exterior angle at vertex ?
Which of the following inequalities is correct?
Is the size of two right angles less than, equal to or greater than the sum of the interior angles of a triangle?